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update

mutate.new.update

(f Unary mutate.new.T mutate.new.T)
 => 
unit
[Contains abstract features]
update mutable field using a function of the old value
0.094dev (2025-06-18 15:08:51 GIT hash 89cffc23ae669b0898a5564fefbf793fcb8e5ca7 built by fridi@fzen)